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Flight Reliability

UA 1991 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 1991 moved between routes during this period. Numbers below combine all of them, so treat them as background, not a verdict. For a cleaner answer, check the route you are actually flying.

Combined across all its routes

67%
Arrive within 15 minutes
30 min
Average arrival delay
3.0%
Cancelled
0 min
Median arrival delay

Based on 461 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon71%(66 flights)
  • Tue74%(61 flights)
  • Wed76%(62 flights)
  • Thu63%(62 flights)
  • Fri64%(66 flights)
  • Sat66%(64 flights)
  • Sun58%(66 flights)
On-time by departure window
  • 6–9 AM91%(11 flights)
  • 12–3 PM72%(108 flights)
  • 3–6 PM60%(210 flights)
  • 6–9 PM73%(116 flights)
  • 9 PM–12 AM—(2 flights)
On-time trend by month
68%
May

Jun 44% → May 68% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202544%34
July 202552%54
August 202571%48
September 202557%30
October 202572%36
November 202568%59
December 202565%48
January 202677%30
February 202682%28
March 202679%29
April 202686%29
May 202668%22
Departures on time
68%
Diverted
0%
Flights flown
447
Months covered
12

Keep nerding

Based on 461 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.